2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.9 1995-03-15 08:37:18 quinn
10 * Revision 1.8 1995/03/10 11:44:40 quinn
11 * Fixed serious stack-bug in odr_cons_begin
13 * Revision 1.7 1995/03/08 12:12:13 quinn
14 * Added better error checking.
16 * Revision 1.6 1995/02/14 11:54:33 quinn
19 * Revision 1.5 1995/02/10 18:57:24 quinn
20 * More in the way of error-checking.
22 * Revision 1.4 1995/02/10 15:55:28 quinn
25 * Revision 1.3 1995/02/09 15:51:46 quinn
28 * Revision 1.2 1995/02/07 17:52:59 quinn
29 * A damn mess, but now things work, I think.
31 * Revision 1.1 1995/02/02 16:21:53 quinn
41 * if p: write tag. return 1 (success) or -1 (error).
44 * if tag && class match up, advance pointer and return 1. set cons.
45 * else leave pointer unchanged. Return 0.
47 * Should perhaps be odr_tag?
49 int ber_tag(ODR o, void *p, int class, int tag, int *constructed, int opt)
51 static int lclass = -1, ltag, br, lcons; /* save t&c rather than
56 if (o->direction == ODR_DECODE)
63 if (o->direction == ODR_ENCODE)
75 if ((rd = ber_enctag(o->bp, class, tag, *constructed, o->left))
84 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d,left=%d]", class, tag,
85 *constructed, o->stackp, o->left);
89 if (o->stackp > -1 && !odr_constructed_more(o))
97 if ((br = ber_dectag(o->bp, &lclass, <ag, &lcons)) <= 0)
103 fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", lclass, ltag,
107 if (class == lclass && tag == ltag)
111 *constructed = lcons;
118 o->error = OREQUIRED;
123 o->error = OREQUIRED;
125 default: o->error = OOTHER; return 0;
130 * BER-encode a class/tag/constructed package (identifier octets). Return
131 * number of bytes encoded, or -1 if out of bounds.
133 int ber_enctag(unsigned char *buf, int class, int tag, int constructed, int len)
135 int cons = (constructed ? 1 : 0), n = 0;
136 unsigned char octs[sizeof(int)], *b = buf;
138 *b = (class << 6) & 0XC0;
139 *b |= (cons << 5) & 0X20;
150 octs[n++] = tag & 0X7F;
152 if (n >= len) /* bounds check */
157 *(b++) = octs[n] | ((n > 0) << 7);
163 * Decode BER identifier octets. Return number of bytes read or -1 for error.
165 int ber_dectag(unsigned char *buf, int *class, int *tag, int *constructed)
167 unsigned char *b = buf;
170 *constructed = (*b >> 5) & 0X01;
171 if ((*tag = *b & 0x1F) <= 30)
179 if (b - buf >= 5) /* Precaution */
182 while (*(b++) & 0X80);